Legal Question in Criminal Law in Illinois

The "permission" should have been in the form of a statutory power of attorney that should have been given to the buyer and the assignment of title properly executed. In addition if there is a separation agrement then this may be an issue. However, if the buyer took possession of the vehicle with an assignment of title that can be properly supported by documentation, the sale "closed" when money was paid, the assignment of title was given with a bill of sale, and unless there was some other kind of "warranty" given, the law presumes a used vehicle is sold "AS IS". You may have to produce documentation supporting the assignment of title but otherwise the buyer is obligated to proceed with the transfer of title and pay any used vehicle taxes (usually based on the bill of sale amount). The bigger issue is that if you did not accompany the buyer to a currency exchange to handle the transfer of title and payment of taxes the vehicle may wind up still being in your name and if it is involved in any accident your continued ownership could be an issue, so until this is worked through I would recommend that whatever insurance you had on it (hopefully at least liability) is not cancelled.